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Your joints are places where two or more bones come together. Your shoulders, elbows, hips, knees, and knuckles are all joints. Your spine has joints, too.

But joints are more than bones. They include the soft tissues around them, such as cartilage, tendons and ligaments. Cartilage is the hard slippery flexible tissue that covers the ends of your bones at a joint. Tendons are tough, flexible bands that connect your muscles to your bones so you can move your joints. Ligaments connect the bones of the joint to each other to keep them stable when you move.

Joint disorders are diseases or injuries that affect your joints. Injuries can happen because of overuse of a joint. Or you could have a sudden injury, such as an accident or a sports injury.

Many diseases can affect the joints. They often cause joint pain and make your joints stiff, red, or swollen. Most of them are chronic. That means they last a long time. Some may never go away completely. Some of the diseases that affect the joints include:

• Arthritis. Arthritis may cause joint pain and swelling. There are many types of this disease. Osteoarthritis is the most common type. Over time, arthritis can cause severe joint damage. It can affect people of all ages. A joint injury when you're young may cause osteoarthritis later in life.
• Lupus. This autoimmune disease affects many parts of the body and can cause joint and muscle pain. Some types of lupus often cause arthritis.
• Sjögren's Syndrome. This autoimmune disease affects glands that make moisture in many parts of the body. The main symptoms are dry eyes and mouth, but it often causes joint pain, too.

Treatments are different depending on the disease. But most treatments include medicines and therapies to relieve pain and other symptoms.

Joint disorders from sudden injuries include:

• Sprains and strains. Sprains are stretched or torn ligaments. Acute strains are stretched or torn muscles or tendons that happen from a sudden injury or movement, such as lifting a heavy object.
• Dislocated joints. A joint is dislocated when the bones are pushed or pulled out of position. A joint dislocation is a medical emergency.

Treatment depends on the type of injury. You can treat many sports injuries at home. But you should call your health care provider if you:

• Have a lot of joint pain, swelling or numbness
• Can't put weight on the joint
• Have pain from an old injury with more swelling, an unstable joint, or a joint that isn't normal in another way

Overuse injuries usually damage the soft tissues of the joint. They can happen when you work a joint too hard by doing the same movements over and over. For example, you could get an overuse injury from playing a musical instrument, playing sports, or doing certain jobs, such as carpentry or painting.

Joint overuse injuries include:

• Bursitis. The bursa is a small fluid-filled sac. It works as a pad between the bones of a joint and the moving parts around it, such as muscles, tendons and skin. With bursitis, the bursa becomes irritated and swollen with extra fluid. Overuse is the most common cause, but injuries, infections and other conditions, such as arthritis, can cause bursitis.
• Tendinitis. This condition happens when you overuse a tendon. It swells and makes the joint painful to move.
• Chronic strain. A strain becomes chronic when your muscles or tendons stretch or tear slowly over time from repeating the same movements.

The treatments for bursitis, tendinitis, and chronic strain are often the same. They usually include rest, keeping the injured joint higher than your heart, and taking medicine to reduce swelling. Your provider may recommend gentle exercise and other treatment. In some cases, your provider may suggest an injection (a shot) of medicine into the joint. If these do not help, you may need surgery.

Getting enough physical activity is one of the most important things you can do to prevent or slow joint disorders. Activity strengthens the muscles around your joints and helps them work better.

When you play sports, wear the right equipment to protect your joints, such as knee pads. If you already have joint problems, ask your provider what type of activities are best for you.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

Osteoarthritis, sometimes called OA, is a type of arthritis that only affects the joints, usually in the hands, knees, hips, neck, and lower back. It's the most common type of arthritis.

In a healthy joint, the ends of the bones are covered with a smooth, slippery tissue called cartilage. The cartilage pads the bones and helps them glide easily when you move the joint. With osteoarthritis, the cartilage breaks down and becomes rough. Sometimes, all the cartilage wears away and the bones rub together. Bumps of extra bone called bone spurs may grow in the joint area.

There is no cure for osteoarthritis. It usually gets worse slowly. But there's a lot you can do to manage the symptoms.

Osteoarthritis affects people in different ways, and not everyone has pain. The most common symptoms are:

• Pain when you move, which often gets better with rest
• Stiffness, especially for the first 30 minutes after you get up from resting
• Swollen joints, especially after using the joint a lot
• Less movement in the joint than normal
• A joint that feels loose or unstable

Researchers aren't sure what causes osteoarthritis. They think that it could be caused by a combination of factors in the body and the environment. Your chance of developing osteoarthritis increases with age. They also know that some people are more likely to develop it than others.

Things that make you more likely to develop osteoarthritis include:

• Aging. Osteoarthritis can happen at any age, but the chance of getting it increases in middle-aged adults and older. After age 50, it is more common in women than in men.
• Being overweight. Extra weight puts more stress on your joints.
• Having a past injury or surgery on a joint. This is often the cause of osteoarthritis in younger adults.
• Doing a lot of activities that overuse the joint. This includes sports with a lot of jumping, twisting, running, or throwing.
• Having a joint that doesn't line up correctly.
• A family history of osteoarthritis. Some people inherit genetic changes that increase their chance of developing osteoarthritis.

There is no specific test for osteoarthritis. To find out if you have osteoarthritis, your provider:

• Will ask about your symptoms and medical history
• Will do a physical exam
• May use x-rays or other imaging tests to look at your joints
• May order lab tests to make sure that a different problem isn't causing your symptoms

The goal of treating osteoarthritis is to ease your pain, help you move better, and stop it from getting worse.

Treatment usually begins with:

• Exercises to improve strength, flexibility and balance
• Weight loss, if needed, to improve pain, especially in your hips or knees
• Braces or shoe inserts (orthotics) that a health care provider fits for you

You can buy some pain relievers and arthritis creams without a prescription. They can be helpful, but it's best to talk to your provider about using them. If they don't help enough, your provider may prescribe injections (shots) into the joint or prescription pain relievers.

Complementary therapies may help some people. Massage can increase blood flow and bring warmth to the area. Some research shows that acupuncture may help relieve osteoarthritis pain. Simple things like heat and ice can help, too.

If none of these treatments help enough, surgery may be an option. You and your provider can decide if it's right for you.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

Temporomandibular disorders (TMDs) are a group of more than 30 conditions that affect your temporomandibular joints (TMJs). You have two TMJs; one on each side of your jaw. They connect your lower jaw to your skull.

TMDs can cause problems in your jaw joint and your muscles that control jaw movement. These problems can include pain, stiffness, and trouble chewing.

There are three main types of TMDs:

• Disorders of your jaw joints
• Disorders of the muscles you use for chewing
• Headaches from a TMD

Many TMDs last only a short time and go away on their own. However, in some cases they can become chronic (long lasting)

Sometimes an injury to the jaw or TMJ can cause a TMD. But in most cases, the cause is not known.

Research suggests that certain factors may play a role in why a TMD starts and whether it will be long lasting:

• Genetics
• Psychological and life stressors
• How someone perceives pain

Anyone can develop a TMD, but it is more common in women than in men. It is most common in women between 35 and 44 years old.

The symptoms of TMDs may include:

• Pain in the chewing muscles and/or jaw joint. This is the most common symptom.
• Pain that spreads to the face or neck.
• Jaw stiffness.
• Limited movement or locking of the jaw.
• Painful clicking or popping in your jaw joint when you open or close your mouth. However, clicking or popping without pain is common and is not a sign of a TMD.
• Tinnitus (ringing in the ears), hearing loss, or dizziness.
• A change in the way the upper and lower teeth fit together.

There is no standard test used to diagnose TMDs, and some other conditions can cause some similar symptoms. This can make TMDs hard to diagnose.

To find out if you have a TMD, your health care provider or dentist:

• Will take a detailed medical history, which includes asking about your symptoms. They will want to know:
  • Where the pain is
  • When you have it
  • What makes it better or worse
  • If it stays in one area or spreads to other parts of your body
  • If you have any other pain conditions such as headache or back pain
• Will examine your head, neck, face, and jaw for:
  • Tenderness
  • Jaw clicking or popping
  • Problems moving your jaw
• May order imaging studies such as an x-ray, MRI, or CT

For many people, the symptoms of TMD are temporary. To help you feel better, your provider or dentist may suggest that you:

• Eat soft foods.
• Apply heat or cold to the face and do some exercises to gently stretch and strengthen your jaw muscles.
• Take over-the-counter pain relievers, such as nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen.
• Stop clenching your jaw, chewing gum, and biting your nails.

If those do not help, your provider or dentist may suggest other treatments such as:

• Physical therapy
• Self-management and behavioral health approaches, which can include:
  • Cognitive behavioral therapy (CBT), a type of psychotherapy. It can help you identify negative thoughts and change them. It can also teach you coping skills.
  • Biofeedback, which involves using electronic devices to teach you to control certain body functions, such as your heartbeat, blood pressure, and muscle tension. For example, it can detect when you tighten your jaw muscles. You can learn how to recognize when this happens and then relax your muscles.
• Medicines such as:
  • Anti-anxiety medicines
  • Antidepressants
  • Anti-seizure medicines
  • Prescription pain relievers
• An intraoral appliance, which is a device that fits over your teeth. Types of intraoral appliances include oral splints and mouth guards. If you are going to use one, it's important to:
  • Know that there is not a lot of evidence that they improve TMD pain.
  • Make sure that the appliance you have is not designed to permanently change your bite.
  • Let your provider or dentist know if it makes your pain worse.
• Complementary treatments, which are treatments that are used along with mainstream medical care. There is limited evidence showing that they help with TMD symptoms. But some providers and dentists may recommend acupuncture and transcutaneous electrical stimulation (TENS). TENS involves using a device to send a gentle electric current to your nerves or muscles. It may help treat pain by interrupting or blocking the pain signals.

If you are still having severe symptoms from a TMD, your provider or dentist may suggest surgery, including implant surgery, or another procedure.

It's important to be careful, because sometimes surgery or another procedure may not work or may even make your symptoms worse. Before any surgery or other procedure, it is very important to get opinions from more than one provider and to completely understand the risks. If possible, get an opinion from a surgeon who specializes in treating TMDs.

NIH: National Institute of Dental and Craniofacial Research

If you feel pain and stiffness in your body or have trouble moving around, you might have arthritis. Any disorder that affects the joints is often called arthritis. Joints are places where two bones meet, such as your elbow or knee.

Most types of arthritis can cause joint pain and inflammation (swelling). Over time, a swollen joint can become severely damaged. Some kinds of arthritis can also cause problems in your organs, such as your eyes or skin. Treatment will depend on the type of arthritis you have.

Common types of arthritis include:

• Osteoarthritis is the most common type of arthritis. It's often related to aging or injury.
• Autoimmune arthritis happens when your body's immune system attacks healthy cells in your body by mistake. Rheumatoid arthritis is the most common form of this type of arthritis.
• Juvenile arthritis is a type of arthritis that happens in children.
• Infectious arthritis is an infection that has spread from another part of your body to the joint. Reactive arthritis is one type.
• Psoriatic arthritis affects people with psoriasis (itchy or sore scaly red and white skin patches).
• Gout is a painful type of arthritis that happens when too much uric acid builds up in your body. It often starts in the big toe. Other joints can also be affected.
• Ankylosing spondylitis is a type of arthritis of the spine that can cause stiffness and make it difficult to move and bend.

Pain, redness, warmth, and joint inflammation are common arthritis symptoms. You may not be able to move your joint as well as it should. Other symptoms could include fever, weight loss, breathing difficulties, or a rash.

Symptoms often get worse as you age. Some symptoms of arthritis may be signs of other illnesses.

A few things that might increase your chance of getting arthritis include:

• Family history. You may be more likely to get certain types of arthritis if a member of your family has the disorder.
• Age. The risk of getting many types of arthritis increases with age.
• Sex. Certain types of arthritis are more common in women, while other types are more common in men.

Other factors that might increase your risk of getting arthritis include having a previous joint injury, obesity, or lupus.

To find out if you have arthritis, your health care provider may:

• Ask you about your medical history, including your symptoms.
• Do a physical exam.
• Order blood tests or take x-rays.

Your provider may refer you to a rheumatologist (a doctor who specializes in arthritis care) for tests, diagnosis, and care.

Treatment depends on the type of arthritis you have. It may include medicine or surgery. Your provider will work with you to improve your symptoms and quality of life.

A few ways to help manage your symptoms include:

• Hot or cold packs
• Relaxation techniques
• Use of splints, braces, and/or assistive devices

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

Gout is a common type of inflammatory arthritis. It causes pain, swelling, and redness in one or more joints. It usually happens as a flare, which can last for a week or two and then gets better. The flares often begin in your big toe or a lower limb.

Gout happens when too much uric acid (urate) builds up in your body over a long time. Uric acid is a waste product your body makes when it breaks down purines. Purines are substances that are in your body's tissues and in many foods.

When your body breaks down old cells or digests foods that contain purine, most of the uric acid that's made dissolves in your blood. Your kidneys filter the uric acid out of your blood, and it leaves your body in your urine (pee).

However, sometimes your body can make too much uric acid or does not remove enough of it. Then the uric acid levels build up in your body, including in your blood. Having too much uric acid in the blood is called hyperuricemia. It does not cause health problems for everyone. But in some people, uric acid forms needle-like crystals. They can form in your joints, which causes gout. The crystals can also cause kidney stones.

Calcium pyrophosphate arthritis, sometimes called pseudogout, is a related disease. It causes similar symptoms and is sometimes confused with gout. But it is caused by a buildup of calcium phosphate, not uric acid.

Many people develop gout. You are more likely to get it if you:

• Are male.
• Are older; it usually develops in middle age.
• Have obesity.
• Have certain health conditions, such as:
  • Heart failure
  • High blood pressure
  • Metabolic syndrome
  • Chronic kidney disease
  • Conditions that cause your cells to break down more quickly, such as psoriasis or some cancers
  • Rare genetic conditions that lead to increased uric acid
• Have a family history of gout.
• Have an unhealthy diet and eat foods that are rich in purines, such as red meat, organ meats, certain seafoods.
• Drink alcohol.
• Eat and drink lots of foods and beverages that contain fructose (a type of sugar).
• Take certain medicines, such as diuretics (water pills), low-dose aspirin, and some medicines that weaken your immune system.
• Take high amounts of niacin (vitamin B-3).

Gout usually happens in only one joint at a time. It is often found in the big toe, but can also affect other joints, including your other toes, ankle, and knee.

Gout flares often start suddenly at night, and the symptoms in the affected joint often include:

• Intense pain, which may be bad enough to wake you up
• Swelling
• Redness
• Warmth

The flares typically get better within a week or two. In between flares, you usually don't have symptoms. Some people may have flares often, while others may not have another flare for years. But over time, if left untreated, your flares may happen more often and last longer.

And if gout is untreated over long periods of time, you can develop tophi. Tophi are hard, uric acid deposits under the skin. They start out as painless, but over time, they can become painful. They can also cause bone and soft tissue damage and misshapen joints.

To find out if you have gout, your health care provider:

• Will take your medical history, which includes asking about your symptoms.
• Will do a physical exam, including examining the affected joint(s).
• May order various tests, such as:
  • A test of a sample of fluid from one of your painful joints. The fluid is examined under a microscope and is checked for uric acid crystals.
  • A uric acid blood or urine test.
  • An ultrasound or special CT scan to look for uric acid crystal buildup in the affected joint and check for other conditions that may be causing the symptoms.

There are effective treatments for gout. Which treatment you get will depend on your symptoms and the cause of your gout. The goals of your treatment will be to:

• Reduce the pain from gout flares, by using medicines such as:
  • Nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen.
  • Acetaminophen and the anti-inflammatory drug colchicine.
  • Oral or injected corticosteroids.
• Prevent future flares, for example by:
  • Making lifestyle changes such as losing weight, limiting alcohol, and avoiding foods high in purines. If you are taking medicines that can cause high uric acid in the blood, your provider may suggest stopping or changing those medicines.
  • If needed, taking medicines to lower uric acid in the blood.
• Prevent tophi and kidney stones, for example with medicines that lower uric acid in the blood.

With early diagnosis, treatment, and lifestyle changes, gout is one of the most controllable forms of arthritis. Treatment and lifestyle changes may help people avoid gout flares, lessen their symptoms, and sometimes even become gout free.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

Most kinds of arthritis cause pain and swelling in your joints. Joints are places where two bones meet, such as your elbow or knee. Infectious arthritis is an infection in the joint. The infection comes from a bacterial, viral, or fungal infection that spreads from another part of the body. Symptoms of infectious arthritis include:

• Intense pain in the joint
• Joint redness and swelling
• Chills and fever
• Inability to move the area with the infected joint

One type of infectious arthritis is reactive arthritis. The reaction is to an infection somewhere else in your body. The joint is usually the knee, ankle, or toe. Sometimes, reactive arthritis is set off by an infection in the bladder, or in the urethra, which carries urine out of the body. In women, an infection in the vagina can cause the reaction. For both men and women, it can start with bacteria passed on during sex. Another form of reactive arthritis starts with eating food or handling something that has bacteria on it.

To diagnose infectious arthritis, your health care provider may do tests of your blood, urine, and joint fluid. Treatment includes medicines and sometimes surgery.

Juvenile arthritis (JA) is arthritis that happens in children. It causes joint inflammation (swelling), pain, stiffness, and loss of motion. Joints are places where two bones meet, such as your elbow or knee. It can affect any joint, but it is more common in the knees, hands, and feet.

JA can affect your child's growth and development, and in some cases, it can also affect other organs. Finding JA early and starting treatment can help manage symptoms and reduce joint damage.

There are several other forms of arthritis affecting children. The most common type of JA in children under age 16 is juvenile idiopathic arthritis (JIA). There are multiple types of JIA. Symptoms and the number of joints affected help determine the type. Some types of JIA are more common in girls.

The exact cause of JA is unknown. Most types are autoimmune disorders. This means that your immune system, which normally helps your body fight infection, attacks your body's tissues.

Symptoms can vary depending on the type of JA. The symptoms of most types include joint pain, swelling, warmth, and stiffness. Your child may not complain of pain or stiffness, but one early sign of JA may be limping or clumsiness in the morning or after resting. Larger joints, such as the knee, may be swollen.

Certain types of JA can cause a high fever, swollen lymph nodes, a rash, growth problems, or eye inflammation in some children. Symptoms can come and go. Some children have just one or two flare-ups. Others have symptoms that never go away.

There is no single test for JA, so it can be hard to diagnose. Your health care provider may:

• Ask about medical history and symptoms.
• Do a physical exam.
• Order blood tests or imaging studies.

A team of providers usually treats JA. Treatment will depend on your child's age, the type of JA, and how bad it is. Treatment can include medicines and physical therapy to help maintain movement and reduce swelling and pain.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

Rheumatoid arthritis (RA) is a form of arthritis that causes pain, swelling, and stiffness in your joints. RA is an autoimmune disease. Although it is most common in the wrist and fingers, this disease can cause your immune system to attack any joint tissue. The inflammation (swelling) that comes with RA can also affect other body parts. Inflammation could cause medical issues in your eyes, skin, heart, nerves, blood, or lungs.

RA differs from osteoarthritis, a common arthritis that often comes with age. RA affects the lining of your joints and damages the tissue that covers the ends of the bones in a joint. Eventually, this might cause your joints to not work as well.

There is no cure for RA, but early treatment can help you manage symptoms, reduce joint damage, and lead a productive life.

Rheumatoid arthritis can happen at any age, but your risk increases as you become an older adult. Your chance of developing RA can also increase if:

• You're a woman. Women are more likely to get RA than men.
• You have a family history. If a member of your family has RA, you're more likely to get the disease.
• You're a smoker.Smoking over a long period of time increases your risk of getting RA and how serious the disease can be.
• You have other medical conditions that may increase your risk of getting RA. These include obesity, gum disease, and lung disease.

No one knows what causes rheumatoid arthritis. A few things that might play a part in getting RA include:

• Your genes are parts of DNA in your cells that are passed down from your parents. Certain genes may increase your risk of getting rheumatoid arthritis, but not everyone with these genes gets RA.
• The environment, which includes things such as cigarette smoke, sometimes triggers RA symptoms.
• Hormones are chemical messengers in your bloodstream that control the actions of certain cells or organs. Researchers think that sex hormones might play a role in getting RA. Women are more likely to develop the disease, and RA symptoms may change during and after pregnancy.

Your immune system may start turning against your body's joints and tissues years before you notice any symptoms of RA. The changes from this type of immune malfunction usually settle in your joints.

RA affects people differently. You might have the disease for only a short time, or your symptoms might come and go. The severe form can be chronic (long-lasting) and may last a lifetime.

Symptoms of rheumatoid arthritis may include:

• Joint pain or stiffness when moving. This is usually worse in the morning or after inactivity. RA usually affects both joints. If one of your hands or knees is affected, so is the other.
• Joint tenderness, redness, and warmth.
• Joint swelling may make daily activities hard. These could include things such as combing your hair, buttoning your clothes, or bending your knees.
• Fatigue, fever, and a loss of appetite.
• Hard bumps (rheumatoid nodules) under your skin near the joints.

There's no single test for rheumatoid arthritis. The disease develops over time. At first, you may only have a few symptoms, making it hard to diagnose RA in its early stages. To find out if you have RA, your health care provider may:

• Ask about your medical history, including your symptoms.
• Ask about your family health history, including relatives who have had RA.
• Do a physical exam, which includes checking your joints, looking for rashes or nodules, and listening to your chest for signs of inflammation in your lungs.
• Order blood tests or imaging studies (x-ray or ultrasound) to make sure other health conditions aren't causing your symptoms since they may be like other types of arthritis and joint conditions.

Your provider may refer you to a rheumatologist (a doctor who specializes in arthritis care) for tests, diagnosis, and care.

There is no cure for RA, but early treatment can help prevent your symptoms from getting worse and damaging your joints. Treatment can include medicine, lifestyle changes, and surgery. These may slow or stop joint damage and reduce pain and swelling.

Your provider may use a combination of treatments. Your treatment may change based on your symptoms.

You can help manage your RA symptoms if you:

• Are physically active
• Keep a healthy weight
• Avoid injuries to your joints
• Avoid activities that have repetitive motions, like bending your knee over and over
• Stop smoking, or don't start

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

A bursa is a small, fluid-filled sac that acts as a cushion between a bone and other moving parts, such as muscles, tendons, or skin. Bursitis occurs when a bursa becomes inflamed. People get bursitis by overusing a joint. It can also be caused by an injury. It usually occurs at the knee or elbow. Kneeling or leaning your elbows on a hard surface for a long time can make bursitis start. Doing the same kinds of movements every day or putting stress on joints increases your risk.

Symptoms of bursitis include pain and swelling. Your doctor will diagnose bursitis with a physical exam and tests such as x-rays and MRIs. He or she may also take fluid from the swollen area to be sure the problem isn't an infection.

Treatment of bursitis includes rest, pain medicines, or ice. If there is no improvement, your doctor may inject a drug into the area around the swollen bursa. If the joint still does not improve after 6 to 12 months, you may need surgery to repair damage and relieve pressure on the bursa.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

Dislocations are joint injuries that force the ends of your bones out of position. The cause is often a fall or a blow, sometimes from playing a contact sport. You can dislocate your ankles, knees, shoulders, hips, elbows and jaw. You can also dislocate your finger and toe joints. Dislocated joints often are swollen, very painful and visibly out of place. You may not be able to move it.

A dislocated joint is an emergency. If you have one, seek medical attention. Treatment depends on which joint you dislocate and the severity of the injury. It might include manipulations to reposition your bones, medicine, a splint or sling, and rehabilitation. When properly repositioned, a joint will usually function and move normally again in a few weeks. Once you dislocate a shoulder or kneecap, you are more likely to dislocate it again. Wearing protective gear during sports may help prevent dislocations.